Even if you do n't understand, it can be used for multi-function automatic measurement. Say goodbye to tedious operations and improve efficiency. Backlit display, clear reading, and lighting function, small size and easy to carry No contact required, can detect power failure Continuous beep test: Yes Diode test: Yes Data retention: Yes Automatic shutdown: Yes DC voltage range: 600V AC voltage range: 600V DC current range: 40V AC current range: 600v Capacitance range: 4mF Battery type: AA battery Colour: black Material: ABS+electronic components Size: 22.5 x 3.5cm Package Contents: 1 x Digital multimeter (including electric pen) Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.